This, for me, is why I have no sympathy whatsoever for these companies. Rather than going after the people doing the infringing, they seek to shut down perfectly legitimate tools instead. The pirate bay is rather like google - it indexes whats out there. If people are uploading infringing content, then thats what gets indexed. This does not mean you seek to shut down the indexer, you go after the uploader. Do this successfully and the pirate bay would only have legit content.
I'm aware that the reason they don't is that this is like playing whack-a-mole, making it far more expensive. Well, thats up to them, they have the money to do it whichever way they want. But thier methods make me an enemy, it makes many musicians thier enemy (Google Dan bull bye bye bpi) and if I ever come to power, I will happily enact massive restructure of copyright in general, with no consideration to these people. You reap what you sow.